# Cadcorp SIS

The Cadcorp Spatial Information System® (Cadcorp SIS®) is an integrated family of geospatial products comprising desktop, web, and developer applications.

Cadcorp SIS Desktop connects directly to the Ordnance Survey Data Hub through dedicated wizards.

## What you need

* OS Vector Tile API added to an API project in the OS Data Hub with an API Key; see [Getting started with an API project](/os-apis/core-concepts/getting-started-with-an-api-project.md) for more information
* Cadcorp SIS (version SIS 9 or later)

## Instructions

{% stepper %}
{% step %}
**Add overlay**

Once a new map has been set up, in the Home tab, click *Add Overlay*.

<figure><img src="/files/UXlHq0EhwVyP19jZ7LWY" alt="Cadcorp SIS Desktop UI highlighting Add Overlay button."><figcaption><p>Cadcorp SIS Desktop UI with the Add Overlay button highlighted.</p></figcaption></figure>
{% endstep %}

{% step %}
**Select API**

In the Overlay Types dialog:

* Select *Ordnance Survey (GB) > OS (GB) Data Hub*, and then click *Next*.

In the OS (GB) Data Hub dialog:

* Select \_OS Vector Tile API.
* **API Key**: Enter your API Key.
* **Premium/Public Sector Plan**: Select this option if you have this plan.
* **Save in the UI settings database (encrypted)**: Select this option.
* Click *Next*.

<figure><img src="/files/8O6YJsFUVgq3m7iD0T76" alt="Cadcorp SIS Desktop OS (GB) Data Hub dialog"><figcaption><p>Cadcorp SIS Desktop OS (GB) Data Hub dialog.</p></figcaption></figure>
{% endstep %}

{% step %}
**Adding layers to the map**

In the OS (GB) Data Hub Vector Tile API dialog, select the appropriate layer from the list of available options, and then click *Finish*.

<figure><img src="/files/mnSxfKeqI7RmcxMRx48R" alt="Cadcorp SIS Desktop OS (GB) Data Hub Vector Tile API dialog"><figcaption><p>Cadcorp SIS Desktop OS (GB) Data Hub Vector Tile API dialog.</p></figcaption></figure>

*The selected layer will then display in the* SIS Workspace Definition (SWD) \_and the data will display in the map area:

<figure><img src="/files/6mqlSD6tk7SUxuskZETI" alt="Cadcorp SIS Desktop showing loaded OS Vector Tiles in SWD and map area"><figcaption><p>Cadcorp SIS Desktop UI showing OS Vector Tile API in the map area.</p></figcaption></figure>
{% endstep %}
{% endstepper %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.os.uk/os-apis/accessing-os-apis/os-vector-tile-api/getting-started/cadcorp-sis.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.